Question 1
The enthalpy change for converting 10.0 g of ice at -25.0 °C to water at 80.0 °C is ________ kJ. The specific heats of ice, water, and steam are


and

respectively. For H
2O,

= 6.01 kJ mol
-1, and

.
◦ 12.28
◦ 6.16
◦ 3870
◦ 7.21
◦ 9.88
Question 2
The equilibrium constant for the reaction below is 7.2 × 10
-4 at 298 K and 1 atm.
HNO
2(aq) + H
2O(l)

NO
2-(aq) + H
3O
+(aq)
When [HNO
2(aq)] = 1.0 M and [NO
2-(aq)] = [H
3O
+(aq)] = 1.0 × 10
-5 M, calculate Δ
G.
◦ -39.1 kJ/mol
◦ +17.9 kJ/mol
◦ -17.9 kJ/mol
◦ +39.1 kJ/mol
◦ -23.02 kJ/mol